单项选择题

Which of the following is the ultimate reason for the decline of tropical rain forests

A．Unfavorable climate.
B．Human abuse of forests.
C．Increase in the temperature.
D．Unusual rainfalls.
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单项选择题
What do people usually think contributed to the decline of North Africa
A．Human factors.
B．Economic factors.
C．Climatic factors.
D．Population factors.
单项选择题
Increase in the temperature of tropical soil ______.
A．might cause the overflow of flood
B．may lead to the loss of organic nitrogen in it
C．will produce a great deal of organic nitrogen
D．is harmless to the growth of rain forests
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